Replacement flex coupler shaft for 8' multi spindle rigid deck rotary cutters, 13-1/4" overall length, 1-3/8" X 6 Splines both ends, one end has an internal spline the other has a rubber shock pad and external hub. Will fit most 8' cut multi spindle decks with 1-3/8" X 6 spline shafts on the gearboxes.